If your looking for rivets for the hull itself i always used aircraft rivets from aircraft spruce n specialty, maybe overkill and i could get them cheaper elsewhere but thats who i used, countersunk for the hull 100* head , and deck where universal head or brazzier head , the drivers were a package deal i bought have 1 flush for countersink and a variety for universal ,button,brazzier heads ,
Hanson rivet co, is another company that produces good rivets i use all the time as well i use them on poly and other tasks